340 ME. O. THOilAS ON MAMMALS FUOM C'E>'TEAL PEEF. [Apr. 18i 



Dr. "Winge says of I. Ju/drobates, that there are " at least one pair 

 on the breast, and two on the belly." 



Fur short, close, and thick, very similar in texture to that of 

 Holochilus apimlis or squamipes. General colour above mouse- 

 grey, strongly grizzled with fulvous ; upper half of ear-margin 

 brown, lower white. Cliin, chest, and belly dirty \^hite, the hairs 

 grey basally, dull white terminally. Upper surface of hands anil 

 feet pure white, except that the metacarpals are slightly tinged 

 with brown ; cilia of hind feet also pure white. Tail abruptly 

 bicolor, brown above, and pure white below throughout its whole 

 length. 



Skull apparently quite as in I. Jii/drohates (see figures 1-4, 

 Plate XXIX.), except that the anterior palatine foramina seem to 

 run further back, ending exactly opposite the most anterior point 

 of m . 



Dimensions of the ti/jye, an adult female in alcohol : — 



Head and body 146 ram.; tail 148; hind foot 36; ear, from 

 notch 9'1, breadth 6-2 ; forearm and hand 33*5. 



Skull — basal length 30*5 ; greatest length 34 ; greatest breadth 

 16 ; nasals, length 11, greatest breadth 4'2 ; intertemporal breadth 

 5 ; interparietal length 2-5, breadth 7"1 ; palate, length 17*3, 

 breadth outside m^ 6-1, inside mi 3*1 ; diastema 8-9 ; palatine 

 foramina, length 6*5 ; length of upper molar series 4*4 ; basi- 

 facial length 19; basi-cranial length ll'o; lower jaw, condyle to 

 incisor tips 22. 



Hah. Chanchamayo. 



This species differs from /. hydrohates in its rather larger size, 

 its more elongated palatine foramina, and especially in its wholly 

 bicolor tail, that member in the allied form being brown above and 

 below, except just at the tip, which is whitish\ /. hydrohates is a 

 native of the Sierra de Merida, Venezuela, some thirteen or four- 

 teen hundred miles north of the home of /. stoJzmanni, but, 

 speaking broadly, upon the same eastern slope of the great Andean 

 chain. 



I have great pleasure in connecting with this handsome animal 

 the name of Dr. Jean Stolzmann, himself one of the best-known 

 and most successful Peruvian collectors, the discoverer of many 

 new Mammals'', through whose kindness I am now enabled to 

 describe the present interesting set of mammals. 



15. Lagidium pallipes, Beun. 



a. Ad. sk. $ . Incapix'ca, Zezioro, Junin. 8/5/90. 



16. Dastpeocta yaeiegata, Tschudi. 



a-c. Ad. 2 fi'iid 2 yg. sk. Chanchamayo. 5/9/90. 



17. Catia cutleei, Benn. 



a. Ad. sk. $ . Incapirca, Zezioro, Junin. 20/6/90. 



^ This coloration of the tail is again curiously suggestive of Hydromys. 

 2 See P. Z. S. 1882, p. 98. 



